EP1820761A2 - Bogenförderrolle mit einer Hohlachse und Vorrichtung mit solch einer Rolle - Google Patents

Bogenförderrolle mit einer Hohlachse und Vorrichtung mit solch einer Rolle Download PDF

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Publication number
EP1820761A2
EP1820761A2 EP07102248A EP07102248A EP1820761A2 EP 1820761 A2 EP1820761 A2 EP 1820761A2 EP 07102248 A EP07102248 A EP 07102248A EP 07102248 A EP07102248 A EP 07102248A EP 1820761 A2 EP1820761 A2 EP 1820761A2
Authority
EP
European Patent Office
Prior art keywords
sheet conveying
conveying roller
diameter
sheet
roller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP07102248A
Other languages
English (en)
French (fr)
Other versions
EP1820761B1 (de
EP1820761A3 (de
Inventor
Yoshimasu Yamaguchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Publication of EP1820761A2 publication Critical patent/EP1820761A2/de
Publication of EP1820761A3 publication Critical patent/EP1820761A3/de
Application granted granted Critical
Publication of EP1820761B1 publication Critical patent/EP1820761B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H27/00—Special constructions, e.g. surface features, of feed or guide rollers for webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/06—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/11—Details of cross-section or profile
    • B65H2404/111—Details of cross-section or profile shape
    • B65H2404/1112—D-shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/11—Details of cross-section or profile
    • B65H2404/114—Built-up elements
    • B65H2404/1141—Built-up elements covering a part of the periphery
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/13—Details of longitudinal profile
    • B65H2404/131—Details of longitudinal profile shape
    • B65H2404/1316—Details of longitudinal profile shape stepped or grooved
    • B65H2404/13163—Details of longitudinal profile shape stepped or grooved in longitudinal direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/13—Details of longitudinal profile
    • B65H2404/131—Details of longitudinal profile shape
    • B65H2404/1317—End profile
    • B65H2404/13171—End profile tapered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/17—Details of bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/18—Rollers composed of several layers
    • B65H2404/184—Rollers composed of several layers light weighted
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/50—Surface of the elements in contact with the forwarded or guided material
    • B65H2404/55—Built-up surface, e.g. arrangement for attaching the surface to the forwarding or guiding element
    • B65H2404/551—Non permanent attachment, i.e. allowing interchange ability of the surface

Definitions

  • the present invention relates to a sheet conveying roller for conveying a sheet, a sheet conveying apparatus having the sheet conveying roller, and an image forming apparatus having the sheet conveying roller.
  • a sheet conveying roller is provided in an image forming apparatus, a printer, a sheet processing apparatus for processing sheets, an image reading apparatus for reading originals, and a sheet handling apparatus, such as sheet conveying apparatus for conveying sheets, mounted in these apparatuses to convey sheets.
  • the image forming apparatus specifically includes a printer, a copier, a facsimile, and a combined machine of them.
  • the sheet conveying roller includes a shaft supported by a bearing at both ends thereof, and a rubber roller as an elastic friction member mounted on outer circumference of the shaft, thus conveying the sheet by the rubber roller portion.
  • the friction member may use a resin, which has equivalent friction factor with that of the rubber roller.
  • the shaft of the sheet conveying roller is a solid shaft finished by machining and polishing.
  • the solid shaft is machined by lathe to give center drilling at the end thereof, cutting off and chamfering at each end thereof, and cutting step for a stepped shaft.
  • the sold shaft is provided with a tightening groove or the like thereon by milling.
  • the solid shaft is subjected to cutting to form a D-shaped cross section by a surface grinder, to drilling for arranging parallel pins by a drilling machine, and to polishing on the outer circumference by a polishing machine. Plating may further be applied in some cases.
  • machined solid shaft as a shaft single body is finished by directly baking rubber or by adhering a rubber roller thereon, followed by polishing the outer circumference of the rubber roller portion to obtain the sheet conveying roller.
  • the shaft of the sheet conveying roller uses a pipe shaft in some cases.
  • the pipe shaft is prepared by introducing a hoop material of metallic thin belt of stainless steel, aluminum, iron, copper into a drawing die to curl the hoop material in the transversal direction thereof to form a cylindrical shape, followed by butting both ends of the curled portions to seamless-weld them into a shape of a pipe.
  • the pipe shaft is cut to a specified length, as needed, to obtain a base pipe.
  • the base pipe is drawn through a die into a specified outer shape.
  • the pipe shaft is treated by centerless polishing to a high precision outer diameter (Refer to Japanese Patent Application Laid-Open No. H11-165361 ) .
  • the pipe shaft may be manufactured by what is called the drawing in which a metal is drawn by spinning, swaging, or pressing.
  • the drawing allows the cylindrical pipe to vary the diameter along the longitudinal direction.
  • the pipe is cut to a specified length, and a stepped boss prepared by machining is integrally fixed to each end of the pipe by press-fitting, friction welding, caulking, or the like. Then, the pipe shaft is machined on the outer circumference thereof centering on the stepped boss to align the pipe shaft with the stepped boss, thus attaining a shaft free from an eccentric motion.
  • a thick-walled pipe is subjected to high precision coaxial machining by lathing on the inner diameter at both ends, and an axial shaft with flange is fixed to each end thereof. Then, the polishing is given on the outer circumference of the pipe centering on the axial shaft at both ends to manufacture a stepped shaft with accurate alignment.
  • the shaft is mounted in a mold of a rubber molding machine to bake a rubber to form a rubber roller thereon, followed by polishing the outer diameter of the rubber roller to assure accuracy of circle and alignment, thus obtaining the sheet conveying roller.
  • the sheet conveying roller When the sheet conveying roller is used in a sheet conveying apparatus, a rubber roller is mounted at almost center of the shaft, or rubber rollers are arranged along the shaft at a certain interval, and, in some cases, further a bearing is mounted at each end of the shaft, while a gear and a pulley may be mounted at one end thereof.
  • the conventional sheet conveying roller is manufactured by a plurality of machining processes. Accordingly, the conventional sheet conveying roller has problems of taking the large number of steps for manufacturing and of consuming machining time and cost.
  • the conventional sheet conveying roller also has problems that, in the step of baking the rubber, the heating of shaft takes a time to delay the molding cycle, which increases the molding cost and increases the energy consumption.
  • the shaft is a solid shaft
  • the mass is heavy and the inertia is large so that the starting time and stopping time of rotation take a long time.
  • the solid shaft has rigidity, the necessary rigidity is only a degree to attain the nipping and conveying force for a thin and light sheet.
  • the conveying force differs with the place of using the sheet conveying roller.
  • a separation pressure is required, while some of them require only a low separation pressure.
  • the roller to feed a sheet from a cassette, or the registration roller to correct the skew feed of the sheet in the sheet feeder need a conveying force of a degree to override the stiffness of the sheet.
  • the sheet conveying roller plays a role of bridging the sheet in the sheet conveying path, and the sheet conveying roller is subjected to relatively light load, thus the nipping pressure between the sheet conveying rollers is set to a low level in some cases.
  • a hollow pipe is weaker in deflection than the solid pipe, and the hollow pipe is not welcomed to sheet feeding which requires reliability.
  • the diameter is reduced to save the material cost in some cases. Even if the shaft diameter is reduced, however, the friction roller is required to have a certain diameter. That is, in the sheet conveying section, to guide a curled sheet smoothly to a nip of the sheet conveying roller pair, there are required a certain gap in the sheet conveying path and a certain roller diameter. Those variables significantly affect the sheet conveying performance. When the diameter of the friction roller is reduced, the curled sheet becomes difficult to enter the nip of the sheet conveying roller pair, which causes the skew feed and jamming in the sheet conveying path.
  • the conventional sheet conveying roller is not provided with the rubber roller thereon over a wide range in the longitudinal direction of the shaft for the case of being mounted in a sheet conveying path, but is provided with the rubber rollers in parts of the shaft at an interval along the longitudinal direction of the shaft to save the material cost of the rubber roller.
  • the shaft is requested to rotate the rubber roller, to be supported at both ends thereof, and to hold gear, pulley, and the like in the drive transmission mechanism.
  • the rubber roller is requested to keep the friction force to surely handle the sheet, and even under abrasion, to keep the sheet conveying speed and friction force within a certain abrasion range.
  • the shaft is not necessarily a solid shaft, and the rubber roller as the friction member does not need a large thickness.
  • the present invention provides a lightweight sheet conveying roller in which the shaft is a pipe shaft, and the thickness of the friction member more than it seems to be necessary is not required.
  • the present invention also provides a sheet conveying apparatus having a lightweight sheet conveying roller, thus increasing the sheet conveying efficiency.
  • the present invention provides an image forming apparatus, which has a lightweight sheet conveying roller to increase the sheet conveying efficiency.
  • the sheet conveying roller according to the present invention includes a shaft supported at both ends thereof by the respective bearings and an elastic friction member mounted on the outer circumference of the shaft, thereby conveying the sheet at a portion of the friction member.
  • the shaft is a pipe shaft, and both ends of the pipe shaft are formed into small-diameter portions, while the mounted portion on which the friction member is mounted is formed into a large-diameter portion having a diameter larger than that of both ends.
  • the sheet conveying apparatus conveys the sheet by the sheet conveying roller, which sheet conveying roller is the above sheet conveying roller.
  • the image forming apparatus includes an image forming portion for forming an image on the sheet, and a sheet conveying roller for conveying the sheet, which sheet conveying roller is the above sheet conveying roller.
  • the sheet conveying roller according to the present invention adopts a pipe shaft as the shaft, and the friction member is mounted on the large-diameter portion of the pipe shaft. Accordingly, the thickness of the friction member can be made into the minimum required thickness in anticipation of an abrasion. As a result, the sheet conveying roller saves the material for the friction member to decrease the cost. Also, the sheet conveying roller becomes light in weight.
  • the sheet conveying apparatus according to the present invention is provided with a lightweight sheet conveying roller, thus increasing the sheet conveying efficiency.
  • the image forming apparatus according to the present invention has a lightweight sheet conveying roller to increase the sheet conveying efficiency. Since the image forming apparatus of the present invention has a lightweight sheet conveying roller, the apparatus can achieve stable image, high image quality, and stable image formation. Furthermore, the image forming apparatus according to the present invention can improve the maintenance performance, reduction in apparatus weight, reduction in weight of driving source owing to the reduction in the driving torque resulting from reduced load, and reduction in the power consumption.
  • FIG. 1 is a cross sectional view taken along the sheet conveying direction of an image forming apparatus in an embodiment of the present invention.
  • FIG. 2A is a perspective view of a sheet conveying roller of a first embodiment
  • FIG. 2B is a cross sectional view taken along the axial direction of the sheet conveying roller of the first embodiment.
  • FIG. 3A is a plan view of a sheet conveying roller of a second embodiment
  • FIG. 3B is a cross sectional view taken along the axial direction of the sheet conveying roller of the second embodiment.
  • FIG. 4A is a plan view of a sheet conveying roller of a third embodiment
  • FIG. 4B is a cross sectional view taken along the line IVB-IVB in FIG. 4A
  • FIG. 4C is a cross sectional view taken along the line IVC-IVC in FIG. 4B.
  • FIG. 5A is an appearance perspective view of a sheet conveying roller of a fourth embodiment
  • FIG. 5B is a plan view of the sheet conveying roller of the fourth embodiment
  • FIG. 5C is a cross sectional view taken along the line VC-VC in FIG. 5B
  • FIG. 5D is a cross sectional view taken along the line VD-VD in FIG. 5B.
  • FIG. 6A is an enlarged plan view of an engaging portion of a rubber roller and a pipe shaft shown in FIG. 5A
  • FIG. 6B is a cross sectional view taken along the line VIB-VIB in FIG. 6A.
  • FIG. 1 is a cross sectional view taken along the sheet conveying direction of an image forming apparatus in an embodiment of the present invention.
  • the image forming apparatus specifically includes a printer, a copier, a facsimile, and a combined machine of them.
  • An apparatus main body 901 of an image forming apparatus 900 includes an original placement table 906, a light source 907, a reader element (CIS: contact image sensor) 908, a sheet feeding portion 909, and an image forming portion 902.
  • the sheet feeding portion 909 has cassettes 910 and 911, which contain sheets S and are detachably mountable to the apparatus main body 901.
  • Each of the cassettes 910 and 911 is provided with a sheet conveying roller 31.
  • the sheet conveying roller 31 has a portion formed into a D-shape in cross section as illustrated in FIG. 5D.
  • a cylindrical photosensitive drum 914, a developing device 915, a transfer charger 916, a separation charger 917, a cleaner 918, and a primary charger 919 are arranged.
  • a sheet conveying apparatus 40 is provided in the apparatus main body 901.
  • the sheet conveying apparatus 40 has a sheet conveying roller 1 (11).
  • the light source 907 irradiates light onto the original D placed on the original placement table 906.
  • the reflected light is converted into an electric image signal via the reader element 908.
  • the electric image signal is then sent to a laser scanner 921, and a laser emission element (not shown) emits laser light to irradiate the photosensitive drum 914 via a polygonal mirror 922 and lenses 923 and 924.
  • the photosensitive drum 914 is charged in advance by the primary charger 919.
  • a light is irradiated to the photosensitive drum 914, a static latent image is formed on the photosensitive drum 914.
  • the static latent image is subjected to toner-developing by the developing device 915 to become a visualized image as a toner image.
  • the sheet S fed from the sheet feeding portion 909 is corrected in the skew feed thereof by a registration roller 912, and, after being adjusted in timing, is fed to the image forming portion 902.
  • the transfer charger 916 transfers the toner image on the photosensitive drum 914 to the sheet S.
  • the sheet S onto which the toner image has been transferred is charged to reverse polarity from the polarity of the transfer charger 916 by the separation charger 917, thus separated from the photosensitive drum 914.
  • the sheet S separated from the photosensitive drum 914 is conveyed to the fixing device 904 by the conveying guide 920.
  • the fixing device 904 heats and presses the sheet S to permanently fix the toner image onto the sheet. Then, the sheet S on which the toner image is fixed is discharged from the apparatus main body 901 by the discharge roller pair 905.
  • FIGS. 2A and 2B illustrate the sheet conveying roller of the first embodiment, mounted in the image forming apparatus 900 of the present invention.
  • FIG. 2A is a perspective view of the sheet conveying roller of the first embodiment.
  • FIG. 2B is a cross sectional view taken along the axial direction of the sheet conveying roller of the first embodiment.
  • the components designated by the same numerals or symbols as those in the sheet conveying roller of the first embodiment have similar structures, and further description thereof are omitted.
  • the sheet conveying roller is mounted on an image forming apparatus, a printer, a sheet processing apparatus for processing sheets, an image reading apparatus for reading originals, and a sheet handling apparatus, such as a sheet conveying apparatus for conveying sheets, mounted on these apparatuses.
  • the sheet conveying roller can also be used as the roller supporting a belt of a belt conveyer. Therefore, the sheet conveying roller is applicable not only at the place of sheet conveying but also at places supporting the article to be conveyed.
  • the sheet conveying roller 1 is structured by a pipe shaft 3 as the shaft, a rubber roller 4 as the friction member, bearings 2a and 2b, and a gear 6.
  • the bearings 2a and 2b and the gear 6 are not necessarily provided.
  • a cylindrical pipe made of stainless steel such as SUS304 having a uniform thickness wall is shaped to form a constriction 3c as the intermediate small-diameter portion, while leaving a large-diameter portion 3d as the mounted portion. Then, a die is inserted into each end of the pipe, followed by pressing the pipe to form an opening hole 3a in the large-diameter portion 3d.
  • the opening hole 3a is formed to communicate the inner side with the outer side of the pipe shaft 3.
  • the pipe shaft 3 is subjected to drawing from both ends thereof, while leaving the large-diameter portion behind, to form a small-diameter portion 3g at each end with a required diameter. The drawing is done by spinning, swaging, and pressing to reduce a part of the outer shape.
  • the tube-shaped rubber roller 4 is mounted to the opening hole 3a as the engaged portion formed on the large-diameter portion 3d.
  • the rubber roller 4 is mounted by mating a projection 4a as the engaging portion formed on the inner surface of the rubber roller 4 with the opening hole 3a, then pushing the projection 4a into the opening hole 3a.
  • the inner surface of the rubber roller 4 and the outer circumferential surface of the pipe shaft 3 can have the mounting force enough against the sheet conveying force. That is, by inserting the projection 4a into the opening hole 3a, the rubber roller 4 is locked by the pipe shaft 3.
  • the rubber roller 4 may be a resin instead of rubber.
  • the rubber roller 4 may be a coating layer illustrated in FIGS. 3A and 3B.
  • the sliding member 5 is a plastic molded article made of a material suitable for a bearing, such as polyoxymethylene (POM) and polyamide (PA), selected depending on the strength of the constriction 3c.
  • the sliding member 5 serving as a bearing is provided on a fixing member of the image forming apparatus main body to bear the conveying pressure force being applied when the sheet conveying roller 1 conveys the sheet.
  • the pipe shaft 3 may have three or more of large-diameter portions 3d or may have two or more of constrictions 3c, or may have no constriction 3c and have only one large-diameter portion 3d.
  • bearings 2a and 2b On the small-diameter portion 3g of the pipe shaft 3, there are mounted bearings 2a and 2b, in a sliding manner, made of a plastic molded article, suitable for the bearing, such as that of polyoxymethylene (POM) and polyamide (PA), and an oil-impregnated metal made of sintered metal.
  • the bearings 2a and 2b may be press-fitted into an inner race of the bearing.
  • the bearings 2a and 2b may be integrally formed with the small-diameter portion 3g of the pipe shaft 3.
  • the small-diameter portion 3g may be press-fitted into the inner race of the bearing.
  • the small-diameter portion 3g of one end of the pipe shaft 3 has an attached portion 3b being formed by press working into a D-shaped cross section.
  • the gear 6 is fitted onto the attached portion 3b and is held by snap-fitting.
  • the gear 6 is connected to the drive source of the image forming apparatus via a gear train and a belt, and the drive is transmitted to rotate the pipe shaft 3.
  • the conventional sheet conveying roller is manufactured by mounting, direct baking, or bonding a rubber on the surface of a solid shaft having straight shape with a small-diameter to decrease the weight of the roller. Consequently, to make the rubber roller have a specified diameter, the thickness of the rubber roller increases, thus increasing the cost. If the diameter of the rubber roller is decreased to decrease the weight of the sheet conveying roller, the abrasion of the rubber roller increases, and the curled sheet comes over the roller to cause jamming. Consequently, the rubber roller generally has to have a specified diameter.
  • the sheet conveying roller 1 of the embodiment adopts the pipe shaft 3 as the shaft, and the large-diameter portion 3d of the pipe shaft 3 allows the rubber roller 4 to mount thereon. Therefore, the thickness of the rubber is reduced to a requisite minimum thickness in anticipation of an abrasion. As a result, the sheet conveying roller 1 saves the rubber material of the rubber roller to decrease the cost. In addition, the sheet conveying roller 1 becomes light in weight.
  • the small-diameter portion 3g at each end of the pipe shaft 3 is drawn to a small diameter, the circumferential speed of sliding rotary surfaces 2aa and 2ba at outer circumference of the bearings 2a and 2b, respectively, can be reduced.
  • the PV value of the sheet conveying roller 1 can be decreased to reduce the abrasion of the bearings 2a and 2b.
  • the bearing becomes small in size to reduce the material cost, and the weight reduction reduces the cost.
  • the P of PV value is the force with which the sheet conveying roller presses the sheet
  • V is the rotational circumferential speed of the bearing portion of the sheet conveying roller. Even when the P value does not vary, the V value decreases so that the PV value decreases as a result.
  • the pipe shaft 3 is covered by the rubber roller 4 only at a portion necessary to convey the sheet. Therefore, the weight of the sheet conveying roller 1 becomes small to reduce cost.
  • the constriction 3c is formed on the pipe shaft 3. Consequently, when a sheet guide member (not shown) is positioned at the constriction 3c, the sheet is surely guided.
  • the sliding member 5 bears the sheet conveying pressure force applied to the sheet conveying roller 1 during the sheet conveyance.
  • the sliding member 5 endures the impact force generated by the sheet entering into the nip of the sheet conveying roller pair, the variations of nipping pressure of the sheet conveying roller pair depending on the sheet thickness, the impact force generated by the rear end of the sheet leaving from the sheet conveying roller pair, and other forces.
  • the sheet conveying roller 1 can convey the sheet in a stable state.
  • the rubber roller 4 By inserting the projection 4a of the rubber roller 4 into the opening hole 3a of the pipe shaft 3 formed by the fuss-free press working, the rubber roller 4 is mounted on the pipe shaft 3. Thus the mounting of rubber roller 4 is conducted also at a low cost.
  • FIGS. 3A and 3B illustrate the sheet conveying roller of a second embodiment.
  • FIG. 3A is a plan view of the sheet conveying roller of the second embodiment.
  • FIG. 3B is a cross sectional view taken along the shaft direction of the sheet conveying roller of the second embodiment.
  • a sheet conveying roller 11 is structured by a pipe shaft 13 as the shaft, a coating layer 17 as the friction member, a wire 18, the bearings 2a and 2b, and the gear 6.
  • the bearings 2a and 2b and the gear 6 are not necessarily provided.
  • the sheet conveying roller 11 of the embodiment has a structure, which is easy to strip the coating layer 17 so as the pipe shaft 13 to be recycled.
  • a cylindrical pipe made of stainless steel such as SUS304 having a uniform wall thickness is drawn only at both ends thereof, while leaving the large-diameter portion 13d behind as the mounted portion, to form the small-diameter portion 3g at both ends of the shaft.
  • the coating layer 17 formed by coating a high friction material thereon is provided.
  • the material of the coating layer 17 is rubber or resin.
  • the large-diameter portion 13d may be a tube-shaped rubber roller as illustrated in FIG. 2 instead of the coating layer 17.
  • the coating layer 17 is formed to have a thickness necessary for durable in use life. That is, the thickness of the coating layer 17 is selected to attain the outer circumferential length of the coating layer 17 within an allowable error range of sheet conveying speed even if the coating layer 17 is abraded to some extent.
  • the wire 18 as a tear member is positioned between the coating layer 17 and the large-diameter portion 13d to tear the coating layer 17 by pulling the wire 18 in the direction away from the large-diameter portion 13d so as to separate the materials.
  • a thin metal tape or plastic tape may be used.
  • the wire 18 has a length extending outward from the large-diameter portion 13d of the pipe shaft 13, and has an end portion 18a bent at about a 90-degree angle.
  • the end portion 18a of wire 18 is inserted into a wire insertion hole 13f on the pipe shaft 13 before coating the coating layer 17 onto the large-diameter portion 13d.
  • the coating layer 17 is coated onto the large-diameter portion 13d.
  • the wire 18 is held between the coating layer and the large-diameter portion 13d.
  • the sheet conveying roller 11 of the second embodiment can save the rubber material of the rubber roller to reduce the cost and the weight.
  • the abrasion of the bearings 2a and 2b can be reduced.
  • the size of bearing can be reduced to save the material, which can also reduce the weight and the cost.
  • the coating layer 17 can readily be separated from the pipe shaft 13, and the pipe shaft 13 is recyclable. Even when the thickness of the coating layer 17 is at a level difficult to be stripped as in the case of the related art, the coating layer 17 can be readily torn.
  • the coating layer 17 is designed to a minimum thickness to attain the outer circumferential length of the coating layer 17 to assure the allowable error range of the sheet conveying speed even if the coating layer 17 is abraded to some extent. Therefore, the coating layer 17 can be easily torn. Incidentally, the thickness of the coating layer 17 is about 1 mm.
  • the coating layer 17 when a tube-shaped rubber roller is mounted on the large-diameter portion 13d, as illustrated in FIG. 2, the rubber roller can easily be removed.
  • FIGS. 4A, 4B, and 4C illustrate the sheet conveying roller of a third embodiment.
  • FIG. 4A is a plan view of a sheet conveying roller of the third embodiment.
  • FIG. 4B is a cross sectional view taken along the line IVB-IVB in FIG. 4A.
  • FIG. 4C is a cross sectional view taken along the line IVC-IVC in FIG. 4B.
  • a sheet conveying roller 21 is structured by a pipe shaft 23 as the shaft, a rubber roller 24 as the friction member, the bearings 2a and 2b, and the gear 6.
  • the bearings 2a and 2b and the gear 6 are not necessarily provided.
  • the sheet conveying roller 21 of the embodiment has a structure for easily removing the rubber roller 24 so that the sheet conveying roller 1 of the first embodiment is recyclable.
  • the rubber roller 24 may be made of a resin instead of rubber.
  • the pipe shaft 23 is manufactured by similar procedure to that of the pipe shaft 3 of the sheet conveying roller 1 of the first embodiment.
  • the pipe shaft 23 has a large-diameter portion 23d as the mounted portion, the small-diameter portion 3g, the constriction 3c, and the attached portion 3b.
  • the sliding member 5 is fitted to the constriction 3c in the snap-fitting manner. Attaching holes 23e, 23f, and 23g are formed in the large-diameter portion 23d as a plurality of engaged portions.
  • the rubber roller 24 is mounted on the large-diameter portion 23d in a C-shaped cross section.
  • holding projections 24a, 24b, and 24c are formed as the engaging portions detachably attachable to the respective attaching holes 23e, 23f, and 23g.
  • the rubber roller 24 is formed in a flat plate shape, and is wound around the large-diameter portion 23d.
  • the holding projections 24a, 24b, and 24c are engaged with the respective attaching holes 23e, 23f, and 23g, thus the rubber roller 24 is mounted around the large-diameter portion 23d in C-shaped cross section.
  • the holding projections 24a, 24b, and 24c are attached to the respective attaching holes 23e, 23f, and 23g without looseness, so that the rubber roller 24 is closely mounted on the large-diameter portion 23d.
  • the sheet conveying roller 21 can be used as a high accuracy sheet conveying roller.
  • the rubber roller 24 mounted around the large-diameter portion 23d has a chevron portion 24d and a valley portion 24e formed therein so as the opposing ends thereof to intermesh with each other. Consequently, the rubber roller 24 is mounted around the large-diameter portion 23d while overlapping the chevron portion 24d and the valley portion 24e with each other. With the configuration, the rubber roller 24 has no groove along the axial direction, and the sheet conveying roller 21 can convey the sheet smoothly.
  • the sheet conveying roller 21 of the embodiment has similar characteristics to those of the sheet conveying roller of the first embodiment illustrated in FIG. 2.
  • the rubber roller 24 when the holding projections 24a, 24b, and 24c are detached from the respective attaching holes 23e, 23f, and 23g after a long period of operation, the rubber roller 24 can be easily removed from the large-diameter portion 23d. Then, the pipe shaft 23 can be reused after separating the rubber roller 24 from the pipe shaft 23, which enhances the effective use of resource.
  • the sheet conveying roller 21 of the embodiment is further used in an assembled state in the apparatus, and even if the rubber roller 24 is damaged, the rubber roller 24 is readily replaced, which leads to easy maintenance, shortening of work time, and reduction in the parts cost.
  • the sheet conveying roller 21 of the embodiment allows replacing with a rubber roller having friction coefficient, hardness, and thickness suitable for the position of the sheet conveying roller, thus enabling the pipe shaft 23 to common use.
  • FIGS. 5A, 5B, 5C, and 5D illustrate the sheet conveying roller of a fourth embodiment.
  • FIG. 5A is an appearance perspective view of a sheet conveying roller of the fourth embodiment.
  • FIG. 5B is a plan view of the sheet conveying roller of the fourth embodiment.
  • FIG. 5C is a cross sectional view taken along the line VC-VC in FIG. 5B.
  • FIG. 5D is a cross sectional view taken along the line VD-VD in FIG. 5B.
  • FIG. 6A is an enlarged plan view of the engaging portion of the rubber roller and the pipe shaft as illustrated in FIG. 5A.
  • FIG. 6B is a cross sectional view taken along the line VIB-VIB in FIG. 6A.
  • a sheet conveying roller 31 of the embodiment has a structure easy to remove a rubber roller 34 to allow the sheet conveying roller 1 to be recyclable.
  • the rubber roller 34 may be made of a resin instead of rubber.
  • the sheet conveying roller 31 has a large-diameter portion 33d as the mounted portion of a pipe shaft 33 in a D-shaped cross section so as the sheets S in the cassettes 910 and 911 to be sent out, as illustrated in FIG. 1.
  • the large-diameter portion 33d is formed in D-shaped cross section to assure a distance between the sheet conveying roller 31 and the sheet.
  • the sheet conveying roller 31 includes the pipe shaft 33 as the shaft, a rubber roller 34 as the friction member, the bearings 2a and 2b, and the gear 6.
  • the bearings 2a and 2b and the gear 6 are not necessarily provided.
  • the pipe shaft 33 is manufactured by the similar procedure to that of the pipe shaft 33 in the sheet conveying roller 1 of the first embodiment, and has the large-diameter portion 33d, the small-diameter portions 3g, and the constriction 3b formed therein.
  • the large-diameter portion 33d is formed in a D-shaped cross section, and has a flat surface 33h.
  • the flat surface 33h is formed to assure a distance from the sheet.
  • the respective attaching holes 33e are formed as the engaged portions.
  • grooves 33k are formed in parallel with the parallel edges of the flat surface 33h.
  • the groove 33k has a projected strip 33m as the engaged portion along the edge of the flat surface 33h.
  • the rubber roller 34 is mounted to the large-diameter portion 33d in a C-shaped cross section. At an end of the rubber roller 34, a holding projection 34a is formed as the engaging portion detachable from the attaching hole 33e. In addition, at an end of the rubber roller 34, a slit hole 34b is formed as the engaging portion to be engaged with the projected strip 33m.
  • the holding projections 34a are attached to the attaching holes 33e without looseness and the projected strips 33m are attached to the slit holes 34b without looseness, so that the rubber roller 34 is closely mounted on the large-diameter portion 33d.
  • the sheet conveying roller 21 can be used as a high accuracy sheet conveying roller.
  • the sheet conveying roller 31 of the embodiment has similar characteristics to those of the sheet conveying roller 11 of the first embodiment.
  • the conventional sheet feeding roller having a large-diameter portion in a D-shaped cross section formed therein is provided with a large-diameter support rotary member, which has a solid shaft holding the sheet feeding rubber roller thereon.
  • An endless belt or a semicircle-shape rubber roller is mounted around a circumferential portion of the large-diameter support rotary member.
  • the sheet conveying roller 31 of the embodiment is formed by mounting the rubber roller 34 around the large-diameter portion 33d which is formed integrally with the pipe shaft 33. Accordingly, the conventionally applied support rotary member can be eliminated to reduce the number of parts. Also, according to the embodiment, weight reduction, strength increase by the integrated structure, and improvement of shape accuracy can be achieved at once.
  • An end of the rubber roller 34 is locked with the projected strip 33m at the center portion and the slit hole 34b at the end center portion of the rubber roller 34.
  • the corners of the rubber roller 34 are locked with the holding projection 34a and the attaching hole 33e.
  • the rubber roller 34 is surely mounted on both edges of the flat surface 33h not interfering the sheet conveying motion.
  • the detachability of the rubber roller 34 can be assured without adversely affecting the engagement of the holding projection 34a and the attaching hole 33e, and of the projected strip 33m and the slit hole 34b.
  • the sheet conveying roller 31 Since the sheet conveying roller 31 has the flat surface 33h formed therein, the variations in torque for separating and conveying the sheet increase.
  • the rubber roller however, has rigidity and strength to endure the torque variations, and is mounted around the large-diameter portion 33d.
  • the sheet conveying roller 31 has a structure integrating the small-diameter portion 3g with the large-diameter portion 33d of the pipe shaft 33. Accordingly, the sheet conveying roller 31 attains sufficient strength and rigidity with a lightweight, and has very small force of inertia, thus the sheet conveying roller 31 faithfully separates and conveys the sheet. In addition, the sheet conveying roller 31 achieves the material cost reduction, the reduced torque owing to the lightweight, and the high accuracy sheet conveyance.
  • the sheet conveying rollers 1, 11, 21, and 31 of the embodiments are formed so as to integrate the large-diameter portions 3d, 13d, 23d, and 33d with the small-diameter portions 3g on the hollow pipe shafts 3, 13, 23, 33, provided therein, respectively.
  • the large-diameter portions 3d, 13d, 23d, and 33d have the rubber rollers 4, 17, 24, and 34 with a small amount of rubber material, respectively.
  • the sheet conveying rollers of the embodiments solve problems including the weight reduction, torque reduction, and the problems depending on the weight by applying the sheet conveying roller to the sheet feeding roller, the sheet conveying roller, the transfer roller, and the like in an image forming apparatus, thereby manufacturing the sheet conveying roller at a low cost contributing to the resource saving. Furthermore, the sheet conveying roller provides an energy saving image forming apparatus.
  • a shaft of a sheet conveying roller is a pipe shaft. Both ends of the pipe shaft are formed into small-diameter portions, and a mounted portion on which a friction member is provided is formed into a large-diameter portion, which has a diameter larger than a diameter of the both ends of the pipe shaft.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Handling Of Cut Paper (AREA)
EP07102248A 2006-02-17 2007-02-13 Bogenförderrolle mit einer Hohlachse und Vorrichtung mit solch einer Rolle Not-in-force EP1820761B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006041565A JP4612899B2 (ja) 2006-02-17 2006-02-17 シート搬送ローラ、シート搬送装置、及び画像形成装置

Publications (3)

Publication Number Publication Date
EP1820761A2 true EP1820761A2 (de) 2007-08-22
EP1820761A3 EP1820761A3 (de) 2008-04-09
EP1820761B1 EP1820761B1 (de) 2010-07-21

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EP07102248A Not-in-force EP1820761B1 (de) 2006-02-17 2007-02-13 Bogenförderrolle mit einer Hohlachse und Vorrichtung mit solch einer Rolle

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US (1) US8052589B2 (de)
EP (1) EP1820761B1 (de)
JP (1) JP4612899B2 (de)
KR (1) KR100935261B1 (de)
CN (1) CN100548839C (de)
DE (1) DE602007007833D1 (de)

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JP4444341B2 (ja) * 2008-03-10 2010-03-31 シャープ株式会社 用紙搬送機構、およびこれを備えた画像形成装置
KR101729102B1 (ko) * 2009-10-27 2017-04-21 엘지전자 주식회사 이동 단말기의 내비게이션 방법 및 그 장치
CN101976029B (zh) * 2010-08-26 2015-08-05 郦春林 用于复印机的加热辊生产工艺
JP5935713B2 (ja) 2013-02-18 2016-06-15 ブラザー工業株式会社 搬送装置及び画像記録装置
JP2015082064A (ja) * 2013-10-24 2015-04-27 キヤノン株式会社 シート搬送装置及び画像形成装置
TWI571423B (zh) 2015-12-24 2017-02-21 時豪 葉 固定裝置及自動化系統
JP7105503B2 (ja) * 2020-11-18 2022-07-25 株式会社上田紙工機 給紙ローラと給紙装置

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GB2132737A (en) * 1982-12-27 1984-07-11 Tokyo Shibaura Electric Co Paper sheet takeout apparatus
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Also Published As

Publication number Publication date
DE602007007833D1 (de) 2010-09-02
KR20070082882A (ko) 2007-08-22
US20070194523A1 (en) 2007-08-23
EP1820761B1 (de) 2010-07-21
CN100548839C (zh) 2009-10-14
JP4612899B2 (ja) 2011-01-12
JP2007217152A (ja) 2007-08-30
EP1820761A3 (de) 2008-04-09
KR100935261B1 (ko) 2010-01-06
CN101024458A (zh) 2007-08-29
US8052589B2 (en) 2011-11-08

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